x=[-3.5 ,-3 ,-2.5, -2, -1.75, -1.5, -1.25, -1, -0.875, -0.75, -0.625, -0.5, 0, 0.5, 0.625, 0.75 ,0.875, 1, 1.25, 1.5 ,1.75, 2 ,2.5 ,3, 3.5];
y=0;
plot(x,y,'ro-','MarkerFaceColor','g');
x2=[-0.375, -0.25, -0.125, 0.125, 0.25, 0.375];
plot(x2,y,'ro-','MarkerFaceColor','r');